# class Student(object):
#     count = 0

#     def __init__(self, name):
#         self.name = name
#         Student.count += 1   # 每创建一个实例，类属性自增

# # 测试:
# if Student.count != 0:
#     print('测试失败!')
# else:
#     bart = Student('Bart')
#     if Student.count != 1:
#         print('测试失败!')
#     else:
#         lisa = Student('Bart')
#         if Student.count != 2:
#             print('测试失败!')
#         else:
#             print('Students:', Student.count)
#             print('测试通过!')



# ka = Student('Ka')
# ka.count=100
# print(ka.count)
# print(Student.count)

